What Is a Column Starter (Also Known as Column Shoe or Column Kicker)?
The starter of the column, often called a column shoe or column kicker, is a critical element in reinforced concrete construction. It’s a short extension at the base of the column, constructed one day before the main column pour.
This element is a guide and base for accurate and stable column placement. Its typical height ranges between 3 to 4 inches (approximately 75 mm to 100 mm), depending on the structure’s design requirements.
Purpose of a Column Starter
The column starter plays a key role in the structural alignment and integrity of the column. It may seem like a minor component, but it performs several essential functions in any concrete structure.
1. Provides a Strong Base for Formwork
The column starter gives firm support to the formwork of the main column. When the main concrete pour begins, the starter acts as a sturdy platform, reducing the risk of movement or misalignment.
2. Ensures Accurate Positioning of Columns
Accurate column placement is vital in any construction project. A starter keeps the column fixed in the right position, preventing shifts during the pour. This ensures vertical alignment and structural correctness.
3. Maintains Design Accuracy as per Drawings
Every structure follows a detailed set of architectural and structural drawings. The column starter helps align the column precisely as per these drawings, ensuring consistency across the construction site.
Why Column Starters Are Crucial in RCC Structures
Even though it’s small, this element supports the entire vertical load of the column during formwork installation. It enhances accuracy, safety, and speed of construction. Ignoring this component may result in alignment issues, formwork displacement, or even failure during casting.
Reduces Human Errors
Using a starter minimizes manual adjustments during formwork placement. Workers follow the starter’s edge, allowing quick and accurate form setting.
Increases Formwork Stability
Formwork displacement can lead to poor concrete finish or major structural defects. A properly cast column kicker acts as a barrier and base, securely anchoring the formwork.
How to Construct a Column Starter Properly
Proper execution of a column starter improves project efficiency. Follow these general steps for the best results:
Mark the exact location of the column based on the layout drawings.
Place and tie reinforcement bars as per the design.
Install a small formwork box (3 to 4 inches high).
Pour and compact the concrete in the formwork.
Cure the concrete and remove the formwork after one day.
Use the starter as a base to install the main column shuttering.
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